Each quarter of a vessel of depth $H$ is filled with liquids of the refractive indices $n_1, n_2, n_3$ and $n_4$ from the bottom respectively. The apparent depth of the vessel when looked normally is

  • A
    $\frac{H(n_1 + n_2 + n_3 + n_4)}{4}$
  • B
    $\frac{H}{4} \left( \frac{1}{n_1} + \frac{1}{n_2} + \frac{1}{n_3} + \frac{1}{n_4} \right)$
  • C
    $\frac{n_1 + n_2 + n_3 + n_4}{4H}$
  • D
    $\frac{H}{2} \left( \frac{1}{n_1} + \frac{1}{n_2} + \frac{1}{n_3} + \frac{1}{n_4} \right)$

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